Jai-roh is a compound adjective as well as a noun. If anything it is a description of a way of life. It personifies lad culture into a mere two syllables that can be used to charm or manipulate disgraced chikas.
one lad: heard you got a piece last night?
other lad: yeah i was elbow deep in a mad chika, she wouldn't leave the next morning so I had to pour ice cold water on her.
one lad: thats so Jai-Roh